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4. What are the results of the research done already?
The research done thus far has produced conflicting results, and many studies have suffered from flaws in
their research methods. Animal experiments investigating the effects of radiofrequency energy (RF)
exposures characteristic of wireless phones have yielded conflicting results that often cannot be repeated in
other laboratories. A few animal studies, however, have suggested that low levels of RF could accelerate the
development of cancer in laboratory animals. However, many of the studies that showed increased tumor
development used animals that had been genetically engineered or treated with cancer-causing chemicals
so as to be predisposed to develop cancer in the absence of RF exposure. Other studies exposed the
animals to RF for up to 22 hours per day. These conditions are not similar to the conditions under which
people use wireless phones, so we don't know with certainty what the results of such studies mean for
human health. Three large epidemiology studies have been published since December 2000. Between them,
the studies investigated any possible association between the use of wireless phones and primary brain
cancer, glioma, meningioma, or acoustic neuroma, tumors of the brain or salivary gland, leukemia, or other
cancers. None of the studies demonstrated the existence of any harmful health effects from wireless phone
RF exposures. However, none of the studies can answer questions about long-term exposures, since the
average period of phone use in these studies was around three years.
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